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Relationship of High Circulating Cystatin C to Biochemical Markers of Bone Turnover and Bone Mineral Density in Elderly Males with a Chronic Heart Failure. J Med Biochem 2019; 38:53-62. [PMID: 30820184 PMCID: PMC6298453 DOI: 10.2478/jomb-2018-0011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 03/17/2018] [Indexed: 12/12/2022] Open
Abstract
Background The aim of the study was to investigate the association of Cystatin C (CysC) to biochemical markers of bone turnover and bone mass, and to evaluate its prognostic significance in elderly males with chronic heart failure (CHF). Methods A prospective cohort study was executed on sixtyeight males (mean age 68±7 years) with mild to moderate CHF, together with 19 of corresponding age- and body mass index-matched healthy individuals who underwent cardio vascular, bone mineral density (BMD), and body com position assessment. Biochemical assessment of all subjects included NT-pro-BNP, parathyroid hormone (PTH), 25-hydroxy vitamin D (25(OH)D), CysC, and biochemical markers of bone turnover including osteocalcin (OC), alkaline phosphatase (ALP), β-CrossLaps (β-CTx), osteoprotegerin (OPG), and receptor activator of nuclear factor κB ligand (RANKL). Results Serum CysC was significantly increased in males with CHF in comparison to healthy control ones. A significant positive association was found between CysC levels and OC in males with CHF, while OC and β-CTx increased in increasing CysC tertiles. In multivariate regression analysis, OC and smoking were a significant determinant of CysC in males with CHF. Level of CysC was found to be positively associated with an increased fatal risk in males with CHF. Conclusions Serum osteocalcin is an independent predictor of CysC level in elderly males with CHF. Higher CysC level showed a negative relation to survival and bone loss in males with CHF. Further research is needed to confirm the potential role of CysC in the crosstalk between heart, kidney, bone, and energy metabolism in CHF.
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Rosa GM, Scagliola R, Ghione P, Valbusa A, Brunelli C, Carbone F, Montecucco F, Monacelli F. Predictors of cardiovascular outcome and rehospitalization in elderly patients with heart failure. Eur J Clin Invest 2019; 49:e13044. [PMID: 30368802 DOI: 10.1111/eci.13044] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 10/22/2018] [Accepted: 10/23/2018] [Indexed: 12/11/2022]
Abstract
BACKGROUND Heart failure (HF) is a major public health problem and represents the only cardiac disease continuing to increase in prevalence, in particular among elderly patients. The frequent rehospitalizations have a negative impact on quality of life of patients with HF, constituting a substantial cost for patients and the health system. The aim of this review was to look into biochemical, echocardiographic and socioeconomical parameters as predictors of clinical outcomes and rehospitalizations. METHODS This narrative review is based on the material searched for and obtained via PubMed from January 2000 up to March 2018. The search terms we used were as follows: "elderly, heart failure, cardiovascular" in combination with "biomarker, echocardiography and hospitalization." RESULTS This review analyses the potential predictive role of biochemical and echocardiographic and socioeconomical parameters on clinical outcomes (particularly cardiovascular) and hospital readmissions in patients with chronic HF. We focused on risk stratification of elderly patients with HF, who constitute a category of frail subjects at higher risk for readmission to hospital. CONCLUSIONS In elderly subjects with chronic HF, the risk stratification could benefit of a multiparametric approach combining biochemical, echocardiographic, demographic and socioeconomical parameters, thus ensuring a better quality of life and at the same time a better allocation of financial resources.
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Affiliation(s)
- Gian M Rosa
- Clinic of Cardiovascular Diseases, University of Genoa, Genoa, Italy.,IRCCS Ospedale Policlinico San Martino Genoa - Italian Cardiovascular Network, Genoa, Italy
| | | | - Paola Ghione
- Clinic of Cardiovascular Diseases, University of Genoa, Genoa, Italy
| | - Alberto Valbusa
- IRCCS Ospedale Policlinico San Martino Genoa - Italian Cardiovascular Network, Genoa, Italy
| | - Claudio Brunelli
- Clinic of Cardiovascular Diseases, University of Genoa, Genoa, Italy.,IRCCS Ospedale Policlinico San Martino Genoa - Italian Cardiovascular Network, Genoa, Italy
| | - Federico Carbone
- Department of Internal Medicine, First Clinic of Internal Medicine, University of Genoa, Genoa, Italy
| | - Fabrizio Montecucco
- IRCCS Ospedale Policlinico San Martino Genoa - Italian Cardiovascular Network, Genoa, Italy.,Department of Internal Medicine, and Centre of Excellence for Biomedical Research (CEBR), First Clinic of Internal Medicine, University of Genoa, Genoa, Italy
| | - Fiammetta Monacelli
- IRCCS Ospedale Policlinico San Martino Genoa, Genoa, Italy.,Department of Internal Medicine, Geriatric Unit, University of Genoa, Genoa, Italy
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Loncar G, Bozic B, Cvetinovic N, Dungen HD, Lainscak M, von Haehling S, Doehner W, Radojicic Z, Putnikovic B, Trippel T, Popovic V. Secondary hyperparathyroidism prevalence and prognostic role in elderly males with heart failure. J Endocrinol Invest 2017; 40:297-304. [PMID: 27738907 DOI: 10.1007/s40618-016-0561-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 10/05/2016] [Indexed: 01/06/2023]
Abstract
AIM Evaluation of secondary hyperparathyroidism (SHPT) and its prognostic impact on all-cause mortality in elderly males with heart failure (HF). METHODS Seventy three males (67 ± 7 years old) with systolic HF were included. Baseline PTH was measured. Patients were grouped according to PTH cut-off levels of 65 pg/ml (>65 pg/ml = SHPT vs. normal PTH). All-cause mortality was evaluated at 6-year follow-up. RESULTS SHPT was diagnosed in 43 (59 %) patients. They were more severe compared to the patients with normal PTH regarding NYHA functional class (2.4 ± 0.5 vs. 2.1 ± 0.2, p = 0.001), quality of life score (34 ± 14 vs. 24 ± 12, p = 0.005), 6-min walking distance (378 ± 79 vs. 446 ± 73 m, p < 0.0001), left ventricular ejection fraction (27 ± 8 vs. 31 ± 7 %, p = 0.019), and NT-proBNP [2452 (3399) vs. 918 (1372) pg/ml, p < 0.0001]. No differences in age, vitamin D status, and renal function were noted between studied groups. A total of 41 (56 %) patients died within 6 years of follow-up. Kaplan-Meier survival analysis showed impaired long-term survival in patients with SHPT versus patients with normal PTH (p = 0.009). The rate of death was highest (75 %) in the group of patients with SHPT and NT-proBNP levels above median value (p = 0.003). Cox regression analysis demonstrated that NT-proBNP was the single independent predictor of all-cause mortality at 6-year follow-up [HR 3.698 (1.927-7.095), p < 0.0001]. CONCLUSION SHPT was highly prevalent in elderly males with HF and was associated with impaired survival. HF patients with SHPT had more severe disease compared to the patients with normal serum PTH. Determination of serum PTH levels provided additional value to NT-proBNP for risk stratification in these patients.
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Affiliation(s)
- G Loncar
- Cardiology Department, Clinical Hospital Zvezdara, Dimitrija Tucovica 161, Belgrade, 11 000, Serbia.
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia.
| | - B Bozic
- Institute for Medical Research, Military Medical Academy, Belgrade, Serbia
- Institute for Physiology and Biochemistry, University of Belgrade, Belgrade, Serbia
| | - N Cvetinovic
- Cardiology Department, Clinical Hospital Zvezdara, Dimitrija Tucovica 161, Belgrade, 11 000, Serbia
| | - H-D Dungen
- Department of Cardiology, Campus Virchow, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - M Lainscak
- Departments of Cardiology and Research and Education, General Hospital Celje, Celje, Slovenia
- Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - S von Haehling
- Innovative Clinical Trials, Department of Cardiology and Pneumology, University of Medicine Göttingen, Göttingen, Germany
- Applied Cachexia Research, Department of Cardiology, Charité-University Medical School, Campus Virchow-Klinikum, Berlin, Germany
| | - W Doehner
- Center for Stroke Research Berlin, Charite University Medical School, Berlin, Germany
| | - Z Radojicic
- Institute for Statistics, Faculty of Organizational Sciences, University of Belgrade, Belgrade, Serbia
| | - B Putnikovic
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia
- Cardiology Department, Clinical Hospital Center Zemun, Belgrade, Serbia
| | - T Trippel
- Department of Cardiology, Campus Virchow, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - V Popovic
- Faculty of Medicine, University of Belgrade, Belgrade, Serbia
- Institute of Endocrinology, Clinical Center of Serbia, Belgrade, Serbia
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Clinical and laboratory determinants of low serum level of 25-hydroxyvitamin D during escalation of pharmacotherapy in heart failure patients. POLISH JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY 2015; 12:216-27. [PMID: 26702277 PMCID: PMC4631913 DOI: 10.5114/kitp.2015.54457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 08/18/2015] [Accepted: 09/03/2015] [Indexed: 01/08/2023]
Abstract
INTRODUCTION The activation of the renin-angiotensin-aldosterone (RAA) system is a main element of the pathophysiology of chronic heart failure (CHF), determining its symptoms and prognosis. Vitamin D is an RAA inhibitor, and its deficiency frequently accompanies CHF. The factors determining the concentration of 25-hydroxyvitamin D [25(OH)D] in CHF are not well understood, although an association has been suggested between the deficiency and the advancement of CHF. Also unknown is the influence of therapeutic escalation using recommended agents on the serum level of 25(OH)D. The aim of this study was to examine the incidence of abnormal 25(OH)D concentrations in CHF patients and to establish the clinical and laboratory determinants of low activity of this metabolite. MATERIAL AND METHODS The retrospective analysis included the data of 412 CHF patients not receiving optimal pharmacological treatment who were initially in NYHA (New York Heart Association) class III or IV. Over the period of 3 months the therapy was escalated until reaching maximum tolerated doses or those recommended by the current guidelines. After optimizing the therapy, the incidence of 25(OH)D deficiency (< 30 ng/ml) and insufficiency (< 20 ng/ml) was established, and clinical and laboratory determinants for these abnormal concentrations were analyzed. RESULTS Normal serum level, insufficiency, and deficiency of 25(OH)D were observed in, respectively, 41.5%, 26.0% and 32.5% of patients. The NYHA class improved by at least 1 class in 63.6% of patients, remained unchanged in 32.8% of patients, and deteriorated in 3.6% of patients. In multivariables analysis, low availability of natural ultraviolet B (UVB) radiation, loss of body mass during the CHF, higher concentrations of phosphates and albumins, and the presence of diabetes increased the risk of 25(OH)D deficiency, while higher concentrations of uric acid reduced this risk. In patients with a positive response to therapy, the concentration of 25(OH)D was borderline significantly higher (p = 0.055), while insufficiency and deficiency were less frequent (p = 0.02) than in patients without a treatment response, but this pertained only to patients with higher exposure to UVB. These differences were not observed in patients with low UVB exposure. CONCLUSIONS The concentration of 25(OH)D in CHF patients is not associated with the advancement of the disease, but is strongly determined by the potential availability of UVB radiation. A positive response to therapy increases the concentration of 25(OH)D only in the case of high UVB exposure; other determinants of 25(OH)D level include the patient's metabolic profile and the presence of diabetes.
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Seirafian S, Haghdarsaheli Y, Mortazavi M, Hosseini M, Moeinzadeh F. The effect of oral vitamin D on serum level of N-terminal pro-B-type natriuretic peptide. Adv Biomed Res 2014; 3:261. [PMID: 25625100 PMCID: PMC4298880 DOI: 10.4103/2277-9175.148234] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Accepted: 12/29/2013] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND The risk of cardiovascular disease in dialysis patients is higher than the general population. Vitamin D receptors exist in myocardium inhibit cardiac hypertrophy. N-terminal pro-B-type natriuretic peptide (NT-pro-BNP) is a neurohormone secreted by the heart in response to ventricular mass increase. This study aimed to evaluate the effect of oral vitamin D on serum level of pro-B-type natriuretic peptide (pro-BNP) in peritoneal dialysis patients. MATERIALS AND METHODS In a randomized clinical trial, 84 peritoneal dialysis patients (49 males and 35 females) were randomly divided into two groups. The intervention group received 50000 units oral vitamin D per week, for 12 weeks if 25-hydroxy-vitamin D level was <10 ng/ml and for 8 weeks if it was between 10 ng/ml and 30 ng/ml. The control group received placebo. Parathyroid hormone, calcium, phosphor, 25-hydroxy-vitamin D, albumin and NT-pro-BNP were evaluated before and after the study. RESULTS The mean serum level of pro-BNP in patients receiving vitamin D and placebo group before the study was 875 pg/ml and 793 pg/ml, respectively. There was 895.9 pg/ml in the intervention group and 736.7 pg/ml in the control group (P = 0.7). Mean serum level of 25(OH) D in patients receiving oral vitamin D and placebo group before the study was 16.9 ng/ml and 31.9 ng/ml, respectively. There was 28.9 ng/ml in the intervention group and 12.9 ng/ml in the control group (P = 0.001). There were no significant differences regarding other indices (Alb, P, Ca, intact parathyroid hormone) between two groups. CONCLUSION Vitamin D did not significantly change the serum level of pro-BNP in peritoneal dialysis patients.
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Affiliation(s)
- Shiva Seirafian
- Department of Internal Medicine and Nephrology, Isfahan Kidney Diseases Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Yalda Haghdarsaheli
- Department of Internal Medicine and Nephrology, Isfahan Kidney Diseases Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mojgan Mortazavi
- Department of Internal Medicine and Nephrology, Isfahan Kidney Diseases Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mohsen Hosseini
- Department of Internal Medicine and Nephrology, Isfahan Kidney Diseases Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Firouzeh Moeinzadeh
- Department of Internal Medicine and Nephrology, Isfahan Kidney Diseases Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
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Gruson D, Buglioni A, Burnett JC. PTH: Potential role in management of heart failure. Clin Chim Acta 2014; 433:290-6. [PMID: 24704306 DOI: 10.1016/j.cca.2014.03.029] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Revised: 03/23/2014] [Accepted: 03/25/2014] [Indexed: 01/10/2023]
Abstract
Biomarkers play an important role for the diagnosis and prognosis of heart failure (HF), a disease with high morbidity and mortality as well as a huge impact on healthcare budgets. Parathyroid hormone (PTH) is a major systemic calcium-regulating hormone and an important regulator of bone and mineral homeostasis. PTH testing is important for differential diagnosis of calcemia related disorders and for the management of patients with chronic kidney disease. As secondary hyperparathyroidism has been evidenced in HF patients, PTH testing might be relevant in HF patients for risk stratification and more personalized selection of treatment.
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Affiliation(s)
- D Gruson
- Pôle de recherche en Endocrinologie, Diabète et Nutrition, Institut de Recherche Expérimentale et Clinique, Cliniques Universitaires St-Luc, Université Catholique de Louvain, Brussels, Belgium; Department of Laboratory Medicine, Cliniques Universitaires St-Luc, Université Catholique de Louvain, Brussels, Belgium.
| | - A Buglioni
- Cardiorenal Research Laboratory, Division of Cardiovascular Diseases, Mayo Clinic and Foundation, Rochester, MN, USA
| | - J C Burnett
- Cardiorenal Research Laboratory, Division of Cardiovascular Diseases, Mayo Clinic and Foundation, Rochester, MN, USA
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Allison RJ, Close GL, Farooq A, Riding NR, Salah O, Hamilton B, Wilson MG. Severely vitamin D-deficient athletes present smaller hearts than sufficient athletes. Eur J Prev Cardiol 2014; 22:535-42. [DOI: 10.1177/2047487313518473] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Richard J Allison
- National Sports Medicine Program, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital, Qatar
- Research Institute for Sport and Exercise Science, Liverpool John Moores University, Liverpool, Merseyside, UK
| | - Graeme L Close
- Research Institute for Sport and Exercise Science, Liverpool John Moores University, Liverpool, Merseyside, UK
| | - Abdulaziz Farooq
- Athlete Health and Performance Research Centre, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital Qatar
| | - Nathan R Riding
- Research Institute for Sport and Exercise Science, Liverpool John Moores University, Liverpool, Merseyside, UK
- Athlete Health and Performance Research Centre, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital Qatar
| | - Othman Salah
- Department of Sports Medicine, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital, Qatar
| | - Bruce Hamilton
- High Performance Sport New Zealand, Auckland, New Zealand
| | - Mathew G Wilson
- Department of Sports Medicine, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital, Qatar
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Eren E, Ellidag HY, Cekin Y, Ayoglu RU, Sekercioglu AO, Yılmaz N. Heart valve disease: the role of calcidiol deficiency, elevated parathyroid hormone levels and oxidative stress in mitral and aortic valve insufficiency. Redox Rep 2013; 19:34-9. [PMID: 24192717 DOI: 10.1179/1351000213y.0000000069] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVES Endothelia, intima, and connective tissues comprise the heart valves, but the relationship between heart valve damage, the pathogenesis of valve degeneration, and vitamin D, oxidative stress remains unclear. Here, we assessed serum 25(OH) vitamin D (calcidiol), parathormone (PTH), and redox balance in patients with mitral valve regurgitation (MR) and aortic valve regurgitation (AR). METHODS This study includes 56 chronic heart valve disease (HVD) patients. Patients were diagnosed with MR or AR depending on the echocardiographic findings. Also, 40 sex-matched healthy control participants were enrolled for comparison. Serum calcidiol, PTH, total oxidative status (TOS), and total antioxidative capacity were measured, and the oxidative stress index (OSI) was calculated. RESULTS Patients with HVD demonstrated significantly higher PTH, increased TOS and OSI, and a higher frequency of calcidiol deficiency than the control participants. Calcidiol and TOS were negatively correlated (r = -0.29; P <0.005), as were calcidiol and OSI (r = -0.413; P = 0.001). PTH and OSI were positively correlated (r = 0.22; P = 0.02). DISCUSSION We demonstrate that vitamin D deficiency and secondary increases in PTH are highly prevalent. Heart valve regurgitation (AR and MR) is correlated to oxidative stress and hypovitaminosis D.
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Fisher A, Srikusalanukul W, Davis M, Smith P. Cardiovascular diseases in older patients with osteoporotic hip fracture: prevalence, disturbances in mineral and bone metabolism, and bidirectional links. Clin Interv Aging 2013; 8:239-56. [PMID: 23460043 PMCID: PMC3585505 DOI: 10.2147/cia.s38856] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Considerable controversy exists regarding the contribution of mineral/bone metabolism abnormalities to the association between cardiovascular diseases (CVDs) and osteoporotic fractures. AIMS AND METHODS To determine the relationships between mineral/bone metabolism biomarkers and CVD in 746 older patients with hip fracture, clinical data were recorded and serum concentrations of parathyroid hormone (PTH), 25-hydroxyvitamin D, calcium, phosphate, magnesium, troponin I, parameters of bone turnover, and renal, liver, and thyroid functions were measured. RESULTS CVDs were diagnosed in 472 (63.3%) patients. Vitamin D deficiency was similarly prevalent in patients with (78.0%) and without (82.1%) CVD. The CVD group had significantly higher mean PTH concentrations (7.6 vs 6.0 pmol/L, P < 0.001), a higher prevalence of secondary hyperparathyroidism (SPTH) (PTH > 6.8 pmol/L, 43.0% vs 23.3%, P < 0.001), and excess bone resorption (urinary deoxypyridinoline corrected by creatinine [DPD/Cr] > 7.5 nmol/μmol, 87.9% vs 74.8%, P < 0.001). In multivariate regression analysis, SHPT (odds ratio [OR] 2.6, P = 0.007) and high DPD/Cr (OR 2.8, P = 0.016) were independent indictors of CVD. Compared to those with both PTH and DPD/Cr in the normal range, multivariate-adjusted ORs for the presence of CVD were 17.3 (P = 0.004) in subjects with SHPT and 9.7 (P < 0.001) in patients with high DPD/Cr. CVD was an independent predicator of SHPT (OR 2.8, P = 0.007) and excess DPD/Cr (OR 2.5, P = 0.031). CVD was predictive of postoperative myocardial injury, while SHPT was also an independent predictor of prolonged hospital stay and in-hospital death. CONCLUSION SHPT and excess bone resorption are independent pathophysiological mediators underlying the bidirectional associations between CVD and hip fracture, and therefore are important diagnostic and therapeutic targets.
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Affiliation(s)
- A Fisher
- Department of Geriatric Medicine, The Canberra Hospital, Canberra, ACT, Australia.
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Secondary hyperparathyroidism: benign bystander or culpable contributor to adverse health outcomes? South Med J 2012; 105:36-42. [PMID: 22189665 DOI: 10.1097/smj.0b013e31823c4155] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Elevation in serum parathyroid hormone (PTH) often accompanies vitamin D deficiency and renal impairment. PTH elevation in renal failure is viewed as an unfavorable development. Evidence is increasing that PTH elevation may be associated with increased morbidity and mortality. In many instances these PTH effects appear to be independent of vitamin D status. PTH mediates its effects through the ubiquitous type 1 PTH/PTH-related peptide receptor, which is notably present in the cardiovascular system. Increased PTH may promote cardiovascular disease through diminished cardiac contractility, enhanced coronary risk, and cardiac valvular and vascular calcification. High PTH levels appear to be linked to the metabolic syndrome and are aligned with hyperlipidemia, decreased insulin sensitivity, and, perhaps, decreased insulin secretion. Increased PTH also is associated with neuroendocrine activation, increased sympathetic activity, and endothelial stress. The relation between PTH and vitamin D is complex and may show significant threshold variations, especially when calcium intake, age, and race are considered. Moreover, evidence is increasing that fragments of PTH may not only be hormonally active but also may have opposing effects to PTH. Despite these caveats, PTH values provide useful clinical diagnostic and prognostic information in monitoring many chronic ailments such as heart and renal failure and multiple sclerosis.
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